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signal/alpha: Document a conflict with SI_USER for SIGFPE

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Setting si_code to 0 is the same as setting si_code to SI_USER.  This
is the same si_code as SI_USER.  Posix and common sense requires that
SI_USER not be a signal specific si_code.  As such this use of 0 for
the si_code is a pretty horribly broken ABI.

Cc: Helge Deller <[email protected]>
Cc: Richard Henderson <[email protected]>
Cc: Ivan Kokshaysky <[email protected]>
Cc: Matt Turner <[email protected]>
Cc: [email protected]
History Tree: https://git.kernel.org/pub/scm/linux/kernel/git/tglx/history.git
Ref: 0a635c7a84cf ("Fill in siginfo_t.")
Signed-off-by: "Eric W. Biederman" <[email protected]>
This commit is contained in:
Eric W. Biederman 2018-04-15 09:53:50 -05:00
commit 5278c0e814
1 changed files with 1 additions and 1 deletions
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arch/alpha/kernel/osf_sys.c
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@ -872,7 +872,7 @@ SYSCALL_DEFINE5(osf_setsysinfo, unsigned long, op, void __user *, buffer,
fex = (exc >> IEEE_STATUS_TO_EXCSUM_SHIFT) & swcr;
if (fex) {
siginfo_t info;
int si_code = 0;
int si_code = FPE_FIXME;
if (fex & IEEE_TRAP_ENABLE_DNO) si_code = FPE_FLTUND;
if (fex & IEEE_TRAP_ENABLE_INE) si_code = FPE_FLTRES;